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Full Discussion: About system calls.
Top Forums UNIX for Dummies Questions & Answers About system calls. Post 302306900 by pludi on Tuesday 14th of April 2009 07:35:51 AM
Old 04-14-2009
System calls are usually done by setting a certain register to a certain value and raising a certain interrupt, thus telling the kernel to do a certain thing to a certain different address.
Anything written as "certain ..." is different for each OS and sometimes even versions of the same OS. System calls are usually hidden behind the C library and should stay there, unless you want to start writing assembler code.
 

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UNIMPLEMENTED(2)					     Linux Programmer's Manual						  UNIMPLEMENTED(2)

NAME
afs_syscall, break, ftime, gtty, lock, mpx, phys, prof, profil, stty, ulimit - unimplemented system calls SYNOPSIS
Unimplemented system calls. DESCRIPTION
These system calls are not implemented in the Linux 2.0 kernel. RETURN VALUE
These system calls always return -1 and set errno to ENOSYS. NOTES
Note that ftime(3), profil(3) and ulimit(3) are implemented as library functions. Some system calls, like ioperm(2), iopl(2), ptrace(2) and vm86(2) only exist on certain architectures. Some system calls, like ipc(2) and {create,init,delete}_module(2) only exist when the Linux kernel was built with support for them. SEE ALSO
obsolete(2) Linux 2.0 1998-06-12 UNIMPLEMENTED(2)
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